package 对象转型;

public   abstract   class A {
    private   int id;
    private   String   name;

    public A() {
    }

    public A(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public  abstract   void   eat();//抽象方法中没有方法体
}
